audit: audit_backlog=65 > audit_backlog_limit=64
==================================================================
BUG: KCSAN: data-race in data_alloc / prb_reserve

write to 0xffffffff86c8e7c8 of 8 bytes by task 1934 on cpu 1:
 data_alloc+0x31c/0x390 kernel/printk/printk_ringbuffer.c:1130
 prb_reserve+0x8d6/0xad0 kernel/printk/printk_ringbuffer.c:1727
 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 audit_log_start+0x709/0x730 kernel/audit.c:1955
 common_lsm_audit+0x65/0x230 security/lsm_audit.c:442
 slow_avc_audit+0x14c/0x190 security/selinux/avc.c:779
 avc_audit security/selinux/include/avc.h:131 [inline]
 avc_has_perm+0x144/0x190 security/selinux/avc.c:1198
 selinux_perf_event_open+0xd3/0xe0 security/selinux/hooks.c:7398
 security_perf_event_open+0x30/0x60 security/security.c:5589
 perf_allow_kernel kernel/events/core.c:14730 [inline]
 __do_sys_perf_event_open kernel/events/core.c:13876 [inline]
 __se_sys_perf_event_open+0x154/0x1270 kernel/events/core.c:13844
 __x64_sys_perf_event_open+0x67/0x80 kernel/events/core.c:13844
 x64_sys_call+0x2789/0x3020 arch/x86/include/generated/asm/syscalls_64.h:299
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

read to 0xffffffff86c8e7c8 of 8 bytes by task 1951 on cpu 0:
 desc_read kernel/printk/printk_ringbuffer.c:496 [inline]
 desc_push_tail kernel/printk/printk_ringbuffer.c:792 [inline]
 desc_reserve kernel/printk/printk_ringbuffer.c:938 [inline]
 prb_reserve+0x216/0xad0 kernel/printk/printk_ringbuffer.c:1677
 vprintk_store+0x54a/0x910 kernel/printk/printk.c:2354
 vprintk_emit+0x1a4/0x600 kernel/printk/printk.c:2455
 vprintk_default+0x26/0x30 kernel/printk/printk.c:2494
 vprintk+0x1d/0x30 kernel/printk/printk_safe.c:82
 _printk+0x79/0xa0 kernel/printk/printk.c:2504
 audit_log_lost+0x1cc/0x200 kernel/audit.c:416
 audit_log_start+0x46f/0x730 kernel/audit.c:-1
 common_lsm_audit+0x65/0x230 security/lsm_audit.c:442
 slow_avc_audit+0x14c/0x190 security/selinux/avc.c:779
 avc_audit security/selinux/include/avc.h:131 [inline]
 avc_has_perm+0x144/0x190 security/selinux/avc.c:1198
 selinux_perf_event_open+0xd3/0xe0 security/selinux/hooks.c:7398
 security_perf_event_open+0x30/0x60 security/security.c:5589
 __do_sys_perf_event_open kernel/events/core.c:13871 [inline]
 __se_sys_perf_event_open+0xc0/0x1270 kernel/events/core.c:13844
 __x64_sys_perf_event_open+0x67/0x80 kernel/events/core.c:13844
 x64_sys_call+0x2789/0x3020 arch/x86/include/generated/asm/syscalls_64.h:299
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x12c/0x3b0 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f

value changed: 0x00000000001ca510 -> 0x000000000027c588

Reported by Kernel Concurrency Sanitizer on:
CPU: 0 UID: 0 PID: 1951 Comm: syz.6.8018 Tainted: G        W           syzkaller #0 PREEMPT(full) 
Tainted: [W]=WARN
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
==================================================================
audit: audit_lost=1010 audit_rate_limit=0 audit_backlog_limit=64